61668518 has 8 divisors (see below), whose sum is σ = 92982648. Its totient is φ = 30674304.

The previous prime is 61668473. The next prime is 61668527. The reversal of 61668518 is 81586616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×61668518² = 7606012224632648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79496 + ... + 80267.

It is an arithmetic number, because the mean of its divisors is an integer number (11622831).

Almost surely, 2^61668518 is an apocalyptic number.

61668518 is a deficient number, since it is larger than the sum of its proper divisors (31314130).

61668518 is a wasteful number, since it uses less digits than its factorization.

61668518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159958.

The product of its digits is 69120, while the sum is 41.

The square root of 61668518 is about 7852.9305357936. The cubic root of 61668518 is about 395.0825400335.

The spelling of 61668518 in words is "sixty-one million, six hundred sixty-eight thousand, five hundred eighteen".